Garden Tips for October – Foothills Sun Gazette


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Maintaining: Complete your annual yard clean up, especially if you have planting beds or entire yards based on naturalistic styles. Don’t be afraid to cut those spring-blooming shrubs back to a third their size. Don’t trim deciduous trees yet; we’ll wait until winter for that. Deadhead roses one final time for a fall bloom. Divide perennials and replant. You can replant iris or wait another month. If you can, grind up the trimmings and use them as mulch for the garden, or add ground up plant debris to the compost bin. Don’t use any plant material that had disease or pest issues; dispose of them in green waste bins in urban areas and the trash can elsewhere.
Deep water your trees a little extra as they enter dormancy—unless we get several nicely spaced storms. Adjust automatic systems to reflect cooler temperatures. In the mountains and foothills, wrap your pipes and remove and store faucet timers before the first frost. If you’ve been affected by wildfires, install erosion control netting and wattles when it is safe to do so before winter storms.
Preemergent herbicide can be applied, except where you plan to grow wildflowers or bulbs, to help prevent annual bluegrass, mustard, mallow (cheeseweed), clover and purslane. Just like with grass and edibles, we have two main seasons of weeds: warm and cool. October is the month all the cool season weeds start popping up. Be ready!
This is a good month to check your tree stakes in anticipation of winter winds. If the tree can stand up on its own and the root ball seems secure, remove the stakes completely, and let it bend in a breeze; this will help the trunk gain strength. Stakes should never be right up against the trunk. Those stakes are for transporting from the nursery, not long-term. If you need to stake a tree, we have information on our website on how to do it properly.
Go easy on the nitrogen-heavy fertilizer as we go into fall, to avoid frost burn of new tender foliage. This is the season, however, to fertilize cool-season lawns and winter-blooming annuals and perennials.
Conserving: Chemical free weed control and plant nutrition is possible. Schedule some time every week or a few times a week to pull or hoe out small weeds as they emerge. Top dress your planting beds and even your lawn with compost. Add another layer of organic mulch to keep your soil healthy. Although adding something from a box or bottle may be quicker, having a healthy balanced garden will in the long run reduce maintenance and improve habitat for a wide range of interesting creatures that won’t harm your garden. Mulch, whether organic or inorganic (rock and decomposed granite) also decreases damage to the soil from rain and reduces both wind and water-caused soil erosion. Although we may need to manage many pest insects in the cool of fall, especially in our edible gardens, identify an unknown insect before you kill it or use insecticides. You may be surprised to find you have a wonderful ally in a beneficial insect. In the edible garden, if a plant is overtaken beyond easy control, it is probably best to remove the plant with the pest. Ornamental, non-annuals can usually tolerate some damage and give you the time to solve the challenge. For many disease issues, cultural practices, such as increasing air circulation, weed control, and encouraging beneficial insects, should be considered part of the solution.
October is a great month to enjoy the garden. Many native plants will have a “false spring” display of flowers and new growth. New transplants will thrive. Tree and shrub leaves will show some fall color. Best of all, it is not too hot to get outside and be part of the garden for more than a few short hours a day. Enjoy!
The Master Gardeners will be live to answer your questions on Saturday, Oct. 2, 10 a.m. to 1 p.m. at Ace Hardware in Visalia. You can also contact them at 559-684-3325, or visit their web site at

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